Can Cucumber hooks differentiate tags

Ruby 2. I have an API realised as a module. It defines a class as simply as

class Foo
  include API
end

but it's also used to extend another module via

module Bar
  class << self
    include API
  end
end

I want to test the behaviour both of an instance of Foo (e.g., Foo.new.methname) but also the module functions (e.g., Bar.methname).

One of my Before hooks defines @exemplar as the default object against tests should be applied. So, the question: how can my Before hook tell whether it should use @exemplar = Bar or @exemplar = Foo.new ?

Alternatively, after playing with tags a bit, let me try a different approach. If a scenario is tagged with @a and @b, and I have Around('@a') and Around('@b') hooks, and cucumber is invoked with -t @a, both hooks get invoked. Is there a way the hook code can tell

1. What the Around('...') argument is (i.e., the value of the '...'), and
2. What tags are actually in the set being applied?

I.e., is there any way the Around('@b') hook can tell that it's for the @b tag expression, and that @b is not in the list of tags being applied?

Thanks!